Can the $H_0$ tension be resolved in extensions to $\Lambda$CDM cosmology?

TL;DR

This study evaluates various extensions to the standard $b7$CDM cosmology to determine if they can resolve the discrepancy between Planck CMB data and local Hubble constant measurements, finding none can convincingly do so.

Contribution

The paper systematically tests multiple extended cosmological models against observational data to assess their effectiveness in resolving the $H_0$ tension.

Findings

Holographic dark energy plus sterile neutrino reduces tension to 1.11$c3$ but is not favored.

The $b7$CDM+$N_{ m eff}$ model is most favored, reducing tension to 1.87$c3$.

None of the models convincingly resolve the $H_0$ tension.

Abstract

We wish to investigate whether there is an extension to the base $\Lambda$CDM cosmology that can resolve the tension between the Planck observation of the cosmic microwave background anisotropies and the local measurement of the Hubble constant. We consider various plausible extended models in this work, and we use the Planck 2015 observation, combined with the baryon acoustic oscillation data, the JLA type Ia supernovae data, and the local measurement of the Hubble constant (by Riess et al. in 2016), to make an analysis. We find that the holographic dark energy plus sterile neutrino model can reduce the tension to be at the 1.11$\sigma$ level, but this model is obviously not favored by the current observations. Among these extended models, the $\Lambda$CDM+$N_{\rm eff}$ model is most favored by the current observations, and this model can reduce the tension to be at the 1.87$\sigma$ level. By a careful test, we conclude that none of these extended models can convincingly resolve the $H_0$ tension.